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Characteristics of Boron Absorption by Excised Barley Roots¹

ABSTRACT

Boron absorption by excised barley roots was found to be noncumulative, rapid, and unaffected by pH variations of the substrate in the acid range. However, increases in pH above 7.0 resulted in sharp reductions in absorption. At pH 6.0, changes in substrate temperature, salt composition and level, or addition of KCN and 2,4-DNP failed to exert any influence on B absorption.

These results indicate that B absorption is a physical, non-metabolic process acting in response to B concentration gradient and that molecular boric acid is favored for absorption.

¹ Contribution from the Department of Soils and Plant Nutrition, University of California Citrus Research Center & Agr. Exp. Sta., Riverside, 92502. Presented before Div. S-4, Soil Science Society of America Meetings, Nov. 12, 1968, New Orleans, La.

² Professor of Soil Science, Graduate Student, and Professor of Soil Science, respectively. The second author is now Assistant Professor of Soil Science, University of Alexandria, Egypt.

Received for publication December 8, 1969. Accepted for publication May 4, 1970.